Apeks XTX40 DS4 – Professional Performance, Entry-Level Accessibility

The Apeks XTX40 DS4 is a fully balanced regulator that combines the technology of the renowned DS4 first stage with a pneumatically balanced XTX series second stage. Designed to offer smooth and reliable breathing in all conditions, it is the ideal choice for divers seeking high performance at an accessible price point — from tropical waters to cold water diving.

First Stage – DS4 Balanced Diaphragm

• DS4 balanced diaphragm system: ensures constant intermediate pressure regardless of cylinder pressure, providing uniform breathing throughout the dive.
• Intermediate pressure over-balancing effect: as you descend deeper, the gas pressure in the hose progressively increases relative to the surrounding environment, improving breathing performance at depth.
• Dry Seal system: a watertight seal isolates the main spring from water, preventing ice buildup in cold water dives and protecting internal mechanisms from silt and contaminants.
• 2 HP ports and 4 angled MP ports: the port arrangement allows for optimal hose routing, with the ability to configure the regulator for both right-hand and left-hand use.
• High-quality satin chrome finish, resistant to marine corrosion.
• Available in DIN (300 bar) and INT (A-clamp) versions.

Second Stage – Pneumatically Balanced XTX

• Pneumatic balancing: the valve mechanism is pneumatically balanced, which results in a constant and reduced inspiratory effort, regardless of depth and residual cylinder pressure.
• Dual-function XTX purge button: large and easy to operate even with gloves, it offers a progressive two-stage purge — side pressure for a reduced, controlled flow, central pressure to maximize the purge effect.
• Adjustable Venturi lever: with a soft rubber grip, it allows you to adjust the incoming airflow to optimize breathing on the surface (– position) and underwater (+ position), reducing the risk of free flow.
• Inhalation effort control knob: allows the diver to customize the valve's sensitivity according to their preferences and diving conditions.
• Patented heat exchanger: surrounds the valve mechanism and dissipates the cold generated by gas expansion, drawing heat from the surrounding water — essential for preventing freezing in cold water.
• Silicone exhaust valve: improves breathing performance by reducing exhalation resistance.
• Comfo-Bite™ mouthpiece: ergonomic design that virtually reduces jaw fatigue during prolonged dives.
• Active antimicrobial protection: all molded parts contain an additive that combats fungi, bacteria, viruses, molds, yeasts, and algae — ideal for shared use or rental.
• Easily convertible from right to left-hand without tools.

📋 Technical Specifications

• Type: Balanced diaphragm first stage + Pneumatically balanced second stage
• Connection: DIN 300 bar / INT (A-clamp)
• HP ports: 2 × 7/16" UNF
• MP ports: 4 × 3/8" UNF (angled)
• Intermediate pressure: ~9.5 bar (with over-balancing effect)
• Environmental sealing: Dry Seal system
• First stage weight: ~680 g (DIN)
• Suitable for cold water: Yes (heat exchanger + Dry Seal)
• Certification: EN250 / CE

✅ Who it's for

The XTX40 DS4 is the perfect choice for divers looking to upgrade to a high-end regulator without sacrificing excellent value for money. Ideal for:

• Sport and advanced divers who dive in cold or temperate waters
• Dive centers and schools looking for reliable and hygienic rental equipment
• Those who want a versatile, configurable, and long-lasting regulator